My husband has been suffering from episodic mental fatigue for months that doctors cannot explain. He states he feels drunk, has light sensitivity, and struggles with multi-tasking. I know his speech slows and he struggles with word retrieval. He has seen a neurologist, had MRI with and without contrast, seen an endocrynologist, and had a lumbar puncture. All with no answers. His current doctor just referred to the neurologist who just told him he isn t sure and he could get a second opinion. What should our next steps be? What specialist should we be seeing or should we try a diffierent neurologist?